Cov khoom siv ntxiv siv los tswj lossis hloov cov kua qaub lossis alkalinity ntawm cov zaub mov hu ua acidity regulators (tseem hu ua sourness agents). Acidity regulators tsis tsuas yog muab cov zaub mov qaub saj, tab sis kuj tswj cov zaub mov pH, ua antioxidants, tiv thaiv cov zaub mov lwj los yog browning, inhibit microbial kev loj hlob, thiab tiv thaiv cov zaub mov lwj.
Cov kua qaub tuaj yeem muab faib ua ob pawg raws li lawv cov muaj pes tsawg leeg: organic acids thiab inorganic acids. Organic acids feem ntau yog siv los ua cov kua qaub. Cov organic acids uas muaj nyob rau hauv tej yam ntuj tso khoom noj mas muaj xws li citric acid, tartaric acid, malic acid, thiab lwm yam; Cov kua qaub uas tsim los ntawm cov khoom noj fermentation muaj xws li acetic acid thiab lactic acid. Feem ntau siv inorganic acid yog phosphoric acid; Cov khoom siv hluavtaws muaj xws li fumaric acid thiab gluconic acid.
